:root {
    --primary: #1E3A8A;
    --secondary: #10B981;
    --accent: #FBBF24;
    --dark: #1A202C;
    --light: #F3F4F6;
    --text: #2D3748;
    --text-light: #FFFFFF;
    --radius: 12px;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  @font-face {
    font-family: 'Montserrat';
    src: local('Montserrat Bold'), local('Montserrat-Bold');
    font-weight: 700;
  }

  @font-face {
    font-family: 'Roboto';
    src: local('Roboto Regular'), local('Roboto-Regular');
    font-weight: 400;
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    background: linear-gradient(135deg, var(--primary), var(--dark));
    color: var(--text-light);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    padding: 0;
    margin: 0;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .hero {
    position: relative;
    padding: 80px 0;
    text-align: center;
    background: radial-gradient(circle at 50% 50%, rgba(30, 58, 138, 0.8), rgba(26, 32, 44, 0.9));
    margin-bottom: 60px;
    border-bottom: 1px solid rgba(251, 191, 36, 0.3);
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    opacity: 0.1;
    z-index: -1;
  }

  .hero h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--accent), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }

  .hero p {
    max-width: 800px;
    margin: 0 auto 30px;
    font-size: 1.2rem;
    opacity: 0.9;
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: var(--radius);
    margin: 20px 0;
    border-left: 4px solid var(--accent);
    font-size: 0.9rem;
  }

  .article-container {
    background: rgba(26, 32, 44, 0.8);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 40px;
    margin: 40px 0;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  article {
    max-width: 900px;
    margin: 0 auto;
  }

  article h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.2rem;
    margin-bottom: 30px;
    color: var(--accent);
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(to right, var(--accent), var(--secondary));
    border-radius: 3px;
  }

  article h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.8rem;
    margin: 40px 0 20px;
    color: var(--secondary);
  }

  article p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.7;
  }

  article strong {
    color: var(--accent);
  }

  article code {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
  }

  article pre {
    background: rgba(26, 32, 44, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 20px;
    margin: 25px 0;
    overflow: auto;
    position: relative;
  }

  article pre code {
    background: transparent;
    color: var(--text-light);
    padding: 0;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .image-card {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.3);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius);
  }

  .image-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent, rgba(26, 32, 44, 0.7));
    border-radius: var(--radius);
  }

  .nav-tabs {
    display: flex;
    justify-content: center;
    margin: 40px 0;
    position: relative;
  }

  .nav-tabs::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(251, 191, 36, 0.5), transparent);
  }

  .tab {
    padding: 15px 30px;
    margin: 0 10px;
    font-family: 'Montserrat', sans-serif;
    font-weight: bold;
    color: var(--text-light);
    text-decoration: none;
    position: relative;
    transition: var(--transition);
  }

  .tab:hover {
    color: var(--accent);
  }

  .tab.active {
    color: var(--accent);
  }

  .tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
    border-radius: 3px 3px 0 0;
  }

  .card {
    background: rgba(26, 32, 44, 0.7);
    border-radius: var(--radius);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.3);
    border-color: rgba(251, 191, 36, 0.3);
  }

  .card h4 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--secondary);
  }

  .button {
    display: inline-block;
    background: linear-gradient(to right, var(--accent), #DFA726);
    color: var(--dark);
    padding: 12px 30px;
    border-radius: 50px;
    font-family: 'Montserrat', sans-serif;
    font-weight: bold;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(251, 191, 36, 0.3);
    transition: var(--transition);
    border: none;
    cursor: pointer;
    margin: 10px 0;
  }

  .button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(251, 191, 36, 0.4);
  }

  .footer {
    text-align: center;
    padding: 40px 0;
    margin-top: 60px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .footer p {
    opacity: 0.7;
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2.2rem;
    }
    
    article h2 {
      font-size: 1.8rem;
    }
    
    article h3 {
      font-size: 1.5rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
    
    .nav-tabs {
      flex-wrap: wrap;
    }
    
    .tab {
      margin: 5px;
      padding: 10px 15px;
    }
  }

  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }

  .floating {
    animation: float 3s ease-in-out infinite;
  }

  .glow {
    text-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
  }